The Breguet 14 was a French biplanebomber and reconnaissance aircraft of World War I. It was built in very large numbers and production continued for many years after the end of the war. Apart from its widespread usage, it was noteworthy for becoming the first aircraft in mass production to use large amounts of metal rather than wood in its structure. This allowed the airframe to be lighter than a wooden airframe of the same strength, in turn making the aircraft very fast and agile for its size, able to outrun many of the fighters of the day. Its strong construction was able to sustain much damage, it was easy to handle and had good performance. The Breguet 14 is often considered one of the best aircraft of the war.

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The aircraft was designed by Louis Breguet, who flew the first prototype (originally designated Breguet AV Type XIV) on its first flight on 21 November 1916. The design was a come-back for Breguet to designing conventional planes, after designing the pusher-type Breguet BUM. Later that month, the French Army's Section Technique de l' Aéronautique (S.T.Aé.) issued requirements for four different new aircraft types. Breguet submitted his new design for two of those categories - reconnaissance aircraft, and bomber.

Following evaluation in February, the Breguet 14 was accepted for both these roles, and in March, orders were placed for 150 reconnaissance aircraft and 100 bombers, designated Breguet 14 A.2 and 14 B.2 respectively (by 1918 written Breguet XIV A2/B2). The A.2 was equipped with a camera, with some carrying radios, while the lower wing of the 14 B.2 was modified slightly in order to accommodate bomb racks (built by Michelin). Both variants featured automatic, bungee-cord operated aerodynamic flaps, but these were not fitted to production aircraft. A number of B2 models were equipped with the U.S. built Liberty engine and were denoted Breguet 14 B2 L.

Other minor variants flown in small numbers during the war included the 14 B.1 long-range single-seat bomber, the 14 GR.2 long-range reconnaissance, the 14 Hfloatplane, the 14 Sair ambulance and the 14 Et.2trainer. Later variants 14bis A2 and 14bis B2 featured improved wing. An improved variant with bigger wings was the 16. There was also the two-seat fighter 17, which was built in small numbers only.

Breguet 14 at the Air Service, United States Army Air Service Production Center No. 2, Romorantin Aerodrome, France, 1918

Following successful deployment by the French, the type was also ordered by the Belgian Army (40 aircraft) and the United States Army Air Service (over 600 aircraft). Around half the Belgian and US aircraft were fitted with Fiat A.12 engines due to shortages of the original Renault 12F. By the end of World War I, some 5,500 Breguet 14s had been produced.

The type continued to be widely used after the war, equipping the French occupation forces in Germany and being deployed to support French troops in the colonies. A special version was developed for the harsh conditions encountered overseas, designated 14 TOE (Théatres des Operations Extérieures). These saw service in putting down uprisings in Syria and Morocco, in Vietnam and in France's attempted intervention in the Russian Civil War. The last trainer examples were not withdrawn from French military service until 1932.

Post war, Breguet had also begun to manufacture dedicated civil versions. The 14 T.2 Salon carried two passengers in a specially modified fuselage. An improved version of this was the 14 Tbis manufactured as both a land-plane and seaplane.[1] The 14 Tbis also formed the basis of the improved 14 Tbis Sanitaire air ambulance version, and 100 mail planes custom-built for Pierre Latécoère's fledgling airline, Lignes Aeriennes Latécoère. After changing name to CGEA, the airline used among others 106 Breguet 14s for flights over Sahara desert. The 18 T was a single 14 T re-engined with a Renault Ja engine and equipped to carry four passengers. When production finally ceased in 1928, the total of all versions built had reached 7,800 (according to other sources, 8,000 or even 8,370).